LifeHacker Article:Spoon ...http://spoon.net/
Can this be made to run portably?? Either with a wrapper or with a portable browser?
I think you might have misunderstood what this is -- it wouldn't require JPE unless they started using a separate program to interface with it. As it just requires a browser like Firefox or another supported browser to connect to their servers which host applications, it should work fine. Some plugins for Firefox do save settings outside of the application folder.
Its a great twist on the cloud desktop idea and (assuming you had a net connection) could make it so you only ever need one portable app.